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  1. Interpret Result Data | Intel® Software

    https://software.intel.com/en-us/node/471884

    Expand the Wait Time metric to view a distribution per processor utilization levels. In the sample application, most of the Wait time is characterized with an ...

  2. Key Terms | Intel® Software

    https://software.intel.com/en-us/node/471922

    The application CPU time is the sum of the CPU time of all the threads that run the application. ... All CPUs are waiting - no threads are running. Poor.

  3. Locks and Waits Analysis | Intel® Software

    https://software.intel.com/en-us/node/544023

    ... Concurrency analysis helps identify where your application is not parallel, Locks and Waits analysis helps identify the cause of ineffective processor utilization.

  4. Interpreting Locks and Waits Data | Intel® Software

    https://software.intel.com/en-us/node/609048

    Use the Intel® VTune™ Amplifier's Locks and Waits viewpoint to identify causes of the poor CPU time utilization such as inefficient synchronization.

  5. Overhead and Spin Time | Intel® Software

    https://software.intel.com/en-us/node/544472

    Spin time is the Wait time during which the CPU is busy. This often occurs when a synchronization API causes the CPU to poll while the software thread is ...

  6. Key Terms | Intel® Software

    https://software.intel.com/en-us/node/680304

    CPU Time: The time during which the CPU is actively executing your application. ... I/O Wait - the CPU core is idle but there is a thread, blocked by an access to ...

  7. Analyze I/O Data in the System Cache Mode | Intel® Software

    https://software.intel.com/en-us/node/680299

    For the diskio application in the system file cache mode, the I/O Wait time is very ... Since disk I/O operations are executed in parallel with CPU operations, the I/O  ...

  8. Locks and Waits Analysis | Intel® Software

    https://software.intel.com/en-us/node/544023?language=ru

    Performance suffers when waits occur while cores are under-utilized. ... CPU time is broken down into thread concurrency states: idle, poor, fair, good, and over.

  9. Profiling I/O bound applications with Vtune

    https://software.intel.com/en-us/forums/intel-vtune-amplifier-xe/topic/590327

    Aug 27, 2015 ... I see that CPU bound profiling is well supported and also lock and ... How about I/ O operations and syscall waiting times (i.e. wall clock times)?

  10. Analyze I/O Data in the Synchronous User Buffer Mode | Intel ...

    https://software.intel.com/en-us/node/680301

    ... mode the application runs faster and takes much less CPU Time but creates a big I/O queue and locates all I/O waits at the end of the application execution.

  11. Window: Summary - Locks and Waits | Intel® Software

    https://software.intel.com/en-us/node/600401

    To access this window, select the Locks and Waitsviewpoint and click the ... Effective CPU Time and Wait Time metrics are classified per CPU utilization as ...

  12. Interpreting Data on Concurrency and CPU Usage | Intel® Software

    https://software.intel.com/en-us/node/609462

    Identify functions with poor concurrency and poor CPU usage. ... Use the Locks and Waits analysis to understand possible reasons why your application does ...

  13. Analyze I/O Data in the Asynchronous User Buffer Mode | Intel ...

    https://software.intel.com/en-us/node/680302

    ... to the I/O device removes the CPU Time overhead but makes the application ... with the CPU activity and it has no I/O Waits anymore; and the second thread is ...

  14. Analyze I/O Data in the System Cache and User Buffer Mode | Intel ...

    https://software.intel.com/en-us/node/680300

    At the same time, the I/O Wait Time metric has grown to almost 3 seconds and now is comparable with the CPU Time, which classifies the application as I/O ...

  15. Summary | Intel® Software

    https://software.intel.com/en-us/node/471860

    Focus on the hotspots - functions that took the most CPU time. By default ... Find lock. You ran the Locks and Waits analysis and identified the following hotspots:.

  16. Concurrency Analysis | Intel® Software

    https://software.intel.com/en-us/concurrency-analysis-win

    VTune Amplifier also shows CPU time while the hotspot was executing. ... possible reasons for the ineffective processor utilization, run Locks and Waits analysis.

  17. Asynchronous Data Transfer and Computation | Intel® Software

    https://software.intel.com/en-us/articles/asynchronous-data-transfer-and-computation

    Feb 21, 2013 ... The host blocks execution and waits until the coprocessor receives all the data .... 3, [Offload] [MIC 0] [CPU Time] 0.010006 (seconds) ...

  18. CPU Usage | Intel® Software

    https://software.intel.com/en-us/node/544409

    CPU usage may be higher than the thread concurrency if a thread is executing code on a CPU while it is logically waiting (that is, the thread is spinning).

  19. Self Time and Total Time | Intel® Software

    https://software.intel.com/en-us/node/544070

    For example, in a single-threaded program with negligible Wait time, the Self time for the function foo() is 10% of the program CPU time. If you optimize foo() so ...

  20. Huge overhead and spin time: openmp worker clone

    https://software.intel.com/en-us/forums/intel-vtune-amplifier-xe/topic/519866

    Jul 31, 2014 ... I know that Spin time means that one thread is blocking to wait the resource free from another thread, it consumes high CPU time. However I did ...

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